Backlight Module Fixing Component for Uniform Thermal Expansion
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Solution Overview
Problem
Conventional vehicle-mounted display panels face challenges in achieving a narrow bezel design due to thermal expansion limitations of the optical film, which results in uneven distances between light sources and frames.
Innovation Solution
A backlight module with a light guide plate, optical film, and a fixing component that allows uniform expansion of the optical film parallel to the light source when heated, using protrusions and notches with an adhesive layer, including a light absorbing material like black ink, to maintain even distances between the optical film and light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical film is thermally expanded toward the side opposite to the steps, then the optical film can expand, but the distance between the light source and frame becomes uneven, which is not beneficial for realizing a narrow bezel display device
Solution Approach 1:
The fixing component is divided into multiple protrusions that are distributed along the light guide plate, which segment the thermal expansion force and allow uniform expansion in multiple directions simultaneously
Solution Approach 2:
The fixing component extends in the vertical direction (thickness direction of light guide plate) rather than only in the horizontal direction, adding a new dimension to constrain thermal expansion and achieve uniform expansion in all directions
2Reliability
If the optical film is constrained by steps, then the optical film can be fixed, but the optical film cannot expand uniformly when heated, resulting in uneven distances
Solution Approach 1:
The fixing component has different structural features at different locations - protrusions on the light incident surface and notches on the lateral surface - to provide localized constraints that enable uniform thermal expansion while maintaining fixing stability
Solution Approach 2:
The fixing component acts as an intermediary between the optical film and the light guide plate, providing a mechanism that allows the optical film to expand uniformly while maintaining its fixed position
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the realization of a narrow bezel display device by ensuring even expansion of the optical film, maintaining uniform distances and preventing interference with the light source, thus enhancing the design flexibility and aesthetics of the display device.
Implementation Method 1
the optical film is expanded uniformly along a direction parallel to the light source when heated
Implementation Method 2
The adhesive layer includes a light absorbing material when the fixing component is disposed on the light incident surface of the light guide plate. In one embodiment, the light absorbing material includes black ink.
Data Source
AI summary
The disclosure provides a backlight module and a display device. The backlight module includes a light guide plate including a light emitting surface, a lateral surface, and a light incident surface disposed correspondingly to the lateral surface. The light emitting surface is connected to the lateral surface and the light incident surface. A light source is disposed correspondingly to the light incident surface and is configured to emit light toward the light incident surface. An optical film is disposed on the light emitting surface. A fixing component is disposed on the light incident surface or the lateral surface and is configured to fasten the optical film on the light emitting surface so that the optical film can be evenly expanded uniformly along a direction parallel to the light source after being heated.